nodejs-promise-timeout

1.0.0 • Public • Published

Node.js Promise Timeout

Resolve or reject a promise automatically when the timeout expires

With this module, you can create a Promise that resolve or rejects automatically after a certain time, unless it has already resolved or rejected.

You can also add a timeout to any existing promise.

Examples

Create a new Promise

To create a new Promise that times out automatically if it hasn't completed in sufficient time, use the constructor of TimeoutResolvePromise or TimeoutRejectPromise.

The constructor takes the timeout in milliseconds and a function that accepts the resolve and reject parameters, which are functions.

const { TimeoutResolvePromise, TimeoutRejectPromise } = require('nodejs-promise-timeout');
const TIMEOUT_DELAY = 2000;
 
// This promise will reject after 2 seconds:
let promise1 = new TimeoutRejectPromise(TIMEOUT_DELAY, (resolve, reject) => {
  // Do something useful here, then call resolve() or reject()
});
 
 
// This promise will resolve after 2 seconds:
let promise2 = new TimeoutResolvePromise(TIMEOUT_DELAY, (resolve, reject) => {
  // Do something useful here, then call resolve() or reject()
});

Add a timeout to an existing Promise

To add a timeout to an existing Promise, use the static setTimeout method of either TimeoutResolvePromise or TimeoutRejectPromise.

When you do that, save a reference to the newly created promise because the original existing promise will not be modified.

const { TimeoutResolvePromise, TimeoutRejectPromise } = require('nodejs-promise-timeout');
const TIMEOUT_DELAY = 2000;
 
// Create some Promise that takes a long time to resolve. In real life, that
// would be your long-running API query, database query and so on.
let existingPromise = new Promise(resolve => setTimeout(resolve, 10 * 1000));
 
// Add a timeout to that existing Promise:
let autoResolvedPromise = TimeoutResolvePromise.setTimeout(TIMEOUT_DELAY, existingPromise);
let autoRejectedPromise = TimeoutResolvePromise.setTimeout(TIMEOUT_DELAY, existingPromise);

Questions

Questions and feedback welcome in the linked Github repository.

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npm i nodejs-promise-timeout

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